Streaming table reads

To read an entire table snapshot, use the readtable subcommand. Data is transferred as a stream, which enables you to read any size table.

Read data:

1. ydb table readtable episodes \
2. --ordered \
3. --limit 5 \
4. --columns series_id,season_id,episode_id,title

Where:

• --ordered: Order read entries by key.
• --limit: Limit the number of entries to read.
• --columns: Columns whose values should be read (all by default) in CSV format.

Result:

1. ┌───────────┬───────────┬────────────┬───────────────────────────────┐
2. | series_id | season_id | episode_id | title                         |
3. ├───────────┼───────────┼────────────┼───────────────────────────────┤
4. | 1         | 1         | 1          | "Yesterday's Jam"             |
5. ├───────────┼───────────┼────────────┼───────────────────────────────┤
6. | 1         | 1         | 2          | "Calamity Jen"                |
7. ├───────────┼───────────┼────────────┼───────────────────────────────┤
8. | 1         | 1         | 3          | "Fifty-Fifty"                 |
9. ├───────────┼───────────┼────────────┼───────────────────────────────┤
10. | 1         | 1         | 4          | "The Red Door"                |
11. ├───────────┼───────────┼────────────┼───────────────────────────────┤
12. | 1         | 1         | 5          | "The Haunting of Bill Crouse" |
13. └───────────┴───────────┴────────────┴───────────────────────────────┘

To only get the number of read entries, use the --count-only parameter:

1. ydb table readtable episodes \
2. --columns series_id \
3. --count-only

Result:

1. 70